This expression is a difference of squares:

Circumference = 2 x pi x radius
27 in = 2 x 3.14 x radius
Solve for the radius
It is 6 units because you find the absolute value of the two different coordinates, in this case it is 4 and -2. Since they belong in different quadrants (one x or y value is positive and the other is negative) you add them. If they are both in the same quadrant, you subtract them.
The answer is 2,181 because 64x34=2176+8=2184-3=2181
The range of the relation is 35,40,45,60,75
Reason being in relation range is the set of all second elements of ordered pairs (y-coordinates).